Failure of lactating ewes with low plasma magnesium values to respond to large daily magnesium supplements

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Abstract
1. 4 g. of Mg per day given as either magnesium oxide or magnesium nitrate failed to increase plasma magnesium levels of fourteen lactating ewes which had initial values of about 1·0 mg. Mg/100 ml.2. Increases which were recorded 4 hr. after drenching were not sustained for the full 24 hr. period between drenches.